Battery-grid.



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Patented July 13, 1909.

ja' ,2 16/ g jjles J. K. PUMPELLY.

BATTERY GRID.

APPLICATION FILED JUNE a, 190s.

vmmsw. ummm con wunnnoamvngws wAsNmGmN4 n c4 'AU-NIT DATEN li JAMES K. PUINIPELLY, OF INDIANAPOLIS, INDIANA, ASSIGNOR OF ONE-llALF lO EDGAR M. VAN NORSTRAN, Ol" INDIANAPOLIS, INDIANA.

BATTERY-GRID.

To all whom it may concern:

De it known that l, J Arias K. PUMrnLLr, a citizen of the United btates, residing at Indianapolis, in the county of Marion and State of Indiana, have invented certain new and useful Improvements in Battery-Grids, of which the following is a specification.

My invention relates to improvements in battery grids.

One of the objects of my invention is to provide a plate or grid adapted to present a large superficial surface to the contacting excitant relative to its weight.

Another object of my invention is to provide in a two part grid a proportionally large quantity of active material and an extensive surface contact between the metal supporting portion of the grid and the pasty contents, as a means for providing low internal resistance and large current capacity. And yet another object of my invention .is to provide a two part grid which is cheap of construction, capable of being cast from a. simple mold and easily and quickly pasted and secured together to constitute substantially a single piece grid structure.

Other and further objects of my invention will become apparent to those persons who are skilled in the art, from a consideration of the speciiication, taken in conjunction with the drawing, wherein;

Figure l is a side elevation of my two plate grid; Fig. 2 is a similar reverse view of the same; Fig. 3 is a cross section taken on line of Fig. l; Fig. 4t is a` transverse cross section, taken on line l--l of Fig. I.

ln all of the views the same reference characters indicate the same parts.

The grid is composed of two plates l0 and ll, similar in every respect with the single exception that plate lt) is provided with laterally extending spurs l2, l2. Ilate ll having registering perforations 13. ltlach plate is provided with laterally extending, tapering, strengthening ribs lll-let# inclosed between the two plates when the element has been completed. It will be noticed that these ribs are located alternately with respect to the ribs of the opposite plate, thus dividing the active material into thin long seetions and breaking up the active material, so to speak, so that the distance from any part thereof to the supporting metallic conductor of the grid is very short. rlhe inclosed active material being so hedged about Specification of Letters Patent.

Application led .Tune S,

Patented July 18, 1909.

1908. Serial No. 437,268.

i by the metallic housing as to render it practically impossible for it to fall away or otherwise be severed from the structure.

Inwardly projecting edges, or frames, l5, l5, surround the perforated sheets lt-lt' and are brought into contact and at their adjoining contacts 17 the parts may be burned together to thus unite the plates lt) and ll into a single element in lieu of the spurs l2 and perforations lil, or if desired, both methods of permanently uniting the plates may be employed.

Conducting and strengthening ribs lS-lb extend vertically and are j )referanly thinner l than the ribs l-l although they may be made tapered and placed in the same relation with regard to their respective alternate positions, if desired.

Active material lt) is shown in Figs. 3 and Ll, and it will be noted that there is a very large superlicial contact between said active material and the conducting structure.

A lug such as 2t), 20 extends vertically from each plate to form electric terminals for the composite plate. rlhey may be burned together if desired, or they may be separately burned to or otherwise connected to the conducting strip of the battery of which the grid forms one element. 'lhe plates are preferably cast in molds, of a proper alloy, and each platte is pasted or lilled with active material, such as an oxid of lead or other active agent, ou the ribbed sides, until the interior of the plates are practically lilled. 'lhen the plates are placed side by side, so that the spurs l2 register with the perlforatitms lll, and then the plates are pressed tightly together between tlat surfaces until the ,marginal edges l5, t5 are in lirm contact the one with the other. The spurs l2 are then turned down, as shown in Fig. 3, to hold the plates together, or the parts may be burned together at the joining contact l?, or both or either means of uniting may be employed.

then the tapered ribs llenter the active material of the opposite plate it displaees the active material by its wedge-like action, and tends to compact the active material on either side thereof, thereby increasing vits density so as to condense a relatively large. quantity within a comparatively small space. 'lhe act of compacting the active material resulting from the means employed to unite the plates affords a cheap inode of construc- IIO tion, brought into eiiect Without the necessity ot an extra operation to produce this highly desirable quality of the element.

The plate proper is so reinforced With ribs, and the material of which the plate is preferably composed, an alloy or' lead and antimony, is of suoli a resilient nature that the enlargement, due to the swelling of the active material under charge and discharge, is very largely prevented, and When it does occur the metallic parts follow the active material as it contracts and thus active contact is always preserved.

lVhile l have shown and described a single embodiment of my invention for purposes of illustrationit is evident that considerable departure may be made therefrom Without departing from the spirit and scope of the claims.

Having thus described my invention, what I claim is 5 l. A two-part battery grid comprising two perforated plates having inwardly projecting tapered ribs extending beyond the marginal ribs, and marginal ribs adapted to be brought into contact to close the housing and spurs on one plate adapted to enter perforations in the other plate to hold the plates together.

2. A two-part battery grid comprising tWo perforated plates, internally projecting marginal ribs adapted to be brought into Contact the one withv the other, a series of internal strengthening ribs extending longi-` tudinally of the plates and adapted to enter the opposite plate and another series of ribs extending vertically of the plates and means for holding the plates together.

In testimony whereof I hereunto set my hand in the presence of tivo Witnesses.

JAMES K. PUMPELLY. In the presence of` ELLAV Gossmr, MARY GRAY. 

